Dense fog conditions in Delhi and other parts of north India brought visibility down to a minimum this morning, delaying at least 29 trains and 150 domestic flights. Cold wave conditions in the capital continued for the fifth consecutive day. In the national capital, visibility was down to 200 metres early this morning. Vehicles were seen moving slowly through the fog cover with hazard lights on. In the early hours, authorities of Delhi airport put out a fog alert, saying low visibility procedures are in progress.